Traffic Classification

This topic maps different enterprise application types into the appropriate per-hop behavior (PHB).

After the QoS requirements for the different applications running on the network have been determined, the next step is to determine how to classify the traffic into multiple service classes. It is best practice to classify and mark traffic as close to the source of the traffic as possible. At the enterprise campus LAN, classification and marking is typically done at the access or distribution layer. Both Cisco IOS routers and IOS Catalyst switches have class-based marking capabilities. NBAR is also supported on Cisco IOS routers and some IOS Catalyst switches (within software).

After the traffic classification requirements have been determined, the next step is to establish the proper scheduling policy for each traffic class. For example, at the WAN edge router where the traffic exits the enterprise campus LAN to enter the WAN, it is best practice to implement LLQ and CBWFQ to provide congestion management.

V LLQs 33%

VoIP Control 2%

VoIP Control 2%

V LLQs 33%

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